Anatomy of Flowering Plants — BIOLOGY STD 11 Science — Question

Ankit, a Xl class student was continuously listening to his sister and her friend's discussion about the growth of plant. They were discussing that plant growth involves three phenomena, i.e., differentiation, dedifferentiation and redifferention. Listening this Ankit interrupted them in between and asked her sister to elaborate the things in detail and the basic phenomenon behind it. As the topic was the part of the Ankit's syllabus also. Her sister explained him that the cells in plant undergo differentiation to attain a maturity in order to perform specific functions.

1. What is dedifferentiation? Name two tissues formed by this process phenomenon.
2. What is redifferentiation?
3. What value is learnt from the Ankit's character as an ideal biology student.

Describe the pectoral girdle of human skeleton.

We know that photosynthesis is the only means because of which we get food. Here are two suggestions to increase the availability of food for human beings. Which of them is good and why?

1. We should replace all plants with those plants from which we get food.
2. We should maintain the diversity of plant species because all plants are To important for us.

Write the functions of epidermal tissue system.

Proteins have a primary structure. If you are given a method to know which amino acid is at either of the two termini (ends) of a protein, can you connect this information to purity or homogeneity of a protein?

The lysosomal enzyme does not destroy the cell's own cytoplasm. Why?

Diatoms are also called as ‘pearls of ocean’, why? What is diatomaceous earth?

Classify bones on the basis of texture.

Describe the structure of an actin filament.